watebous



(No Model.)

J. E. WATBROUS.

VALVE EOE STEAM ENGINES.

No. 449,504. PatentedlVIar. 31, 1891.v

. require.

UNITED STATES PATENT (lrErcE,

JULIUS E. VATEROUS, OF BRANTFQRD, CANADA.

VALVE FOR STEAM-ENGINES.

SPECIFICATION forming part of Letters Iiatent N0. 449,504, dated March 31, 1891.

Application iilerd May 16, 1890.

of Valves for Steam-Engines, of which the` following is a specification.

My invention relates to improvements in steam-engines in which two circular or rotary exhaust-valves are placed in separate steam and exhaust chests on the lower side of a steam-engine cylinder, as near the ends as possible, and two admission and cut-off valves of the piston type placed in one steam-chest on the side of the cylinder immediately above, and connected to and forming a part of the steam-chests containing the exhaust-valves; and the objects of my improvement are, iirst, to provide exhaust-valves, one at each end of the cylinder, with as short ports or passages into and from the cylinder as possible, and so arranged that when the steam in the cylinder has accomplished its work and is released it passes directly out into the exhaust-chamber through the opening under the valve, which at the same time prevents the remaining steam in the steam-chest from escaping, which would be the case if these valves and ports were not arranged in this way; second, to provide separate admission and cut-off valves arranged as stated above, and connected to the steam-chest containing the exhaust-valves and arranged in such a manner that when the steam is admitted by these valves it passes into the steam chest of the exhaust -valves over the latter, directly into the port leading to the cylinder, these admission y and cut-oit valves being operated by an eccentricattached to the governor, they being entirely automatic in their operation; third, to provide an easy means of adjustment for the admission and cut-off valves, which are placed on and operated by one spindle, so that they can be readily set or their lead changed,as the case may I attain these objects bythe mechanism illustrated in the accompanying drawings, in which-- Figure l is a side elevation of an enginecylinder, showing the arrangement of valves in broken section. Fig. 2 is an end elevation of an engine-cylinder, showing the relative Serial No. 352,111. (No model.)

and provided with an ordinary piston and piston-rod, as shown at II, having the steamchest C C, containing the admission and cutoff valves G G G G, spindle 71 extension-nut e, and valve-bushes a d, placed on the side of the cylinder, as shown in the drawings. In this steam-chest there are four valves,t\vo placed in each bush, and each havingtwo openings or steam-passages d d, which correspond with those in the bushes, thus giving double openings to each end of the cylinder. These valves are connected and operated by one spindle h, which is connected to and controlled byan eccentric attached to the governor. Thus only sufiicient steam is allowed to pass through these valves into the cylinder to keep the engine running Vat its proper speed. These Valves are held in place by the collar f and the jam-nuts 0, and are provided with an extension-nut e, which is fitted with a right and left hand thread, so that the valves may be extended or brought together, as the case may require. To give them the necessary lead and lap, openings for this purpose are provided in the outer case and are covered by caps I I. To prevent their leaking through wear the valves are provided with an expansion-ring, as shown at g, Fig. 3.

When the valves are opened, the steam passes into the lower steam-chest E, over the exhaust-valves F into the cylinder through the ports p. Vhen the point of cut-off is reached by the piston, these valves are closed. This point is regulated by the governor, but is never allowed to go beyond three-quarter stroke, so that they are always closed before the exhaust takes place. Vhen the piston has inished its stroke and the steam is to be released, it passes out of the cylinder through the port p and opening S under the exhaustvalve F, which while the exhaust is taking The steam-cylinder A is of the usual form IOO place connects the steam-port p with the exhaust-port J, thus making one continuous opening leading from the cylinder to the exhaust-box K, where it finally escapes through the opening L.

These exhaust valves are driven by one eccentric attached to the engine-shaft, so that their motion is always a positive one, and the exhaust-ports S under the valves are so arranged that they begin to open to release the steam from the cylinder from the steam side of the piston as the latter approaches the end of the stroke, while the opposite valve is made to close on the exhaust side of the piston,thus giving the latterthe required cushion.

I am aware that prior to my invention'circular or rotary valves, such as I have adopted for exhaust-valves, have been in use, andI do not claim them broadly; and I also know that piston-valves have been in use before my invention; but I am not aware that hollow piston-valves, each having double openings, such as shown and described above, have ever been used as admission and cut oft' valves in combination with circular or rotary exhaust-valves. Therefore WVhat I claim as my invention, and desire to secure by Letters Patent, is Y l. The combination, in a steaniengine, of two circular exhaust-valves F F, placed in separate steam-chests E E, one at each end ot' thel cylinder at right angles to its bore, with two admission and cut-ott valves G G of the piston type contained in one steam-chest placed on the side of the cylinder immediately above and connected to and forming a part of the steam-chests containing the exhaustvalves, all substantially as set forth.

2. The combination of two hollow pistonvalves G G, placed in one steam-chest C on the side of an engine-cylinder, each having two ports or steam-passagesddwith and leading directly into the steam-chests E E, containing the exhaust-valves F F, in such a manner that the inowing steam passes through the admission-valves into the steam-chests E, over the exhaust-valves F, and into the steamport p on its Way to the cylinder, substantially as described.

3. The combination of two admission .and cut-ott valves G G in one steam-chest placed on and operated by one spindle 72, and connected to each other with an extension-nut e, fitted to the stem of the valves bya right and left hand screw in such a way that the valves can beV extended or drawn together, as required, all substantially as set forth.

Brantford, May 13, 1890. Y l

J. E. WATEROUS.

Vitnesses:

WALTER T. MAIR, J. H. OLDHAM. 

